According to her own complex moral calculations, Katie Carr has earned her affair. She's doctor, after all, and doctors are decent people, and on top of that, her husband David is the self-styled Angriest Man in Holloway. But when David suddenly becomes good - properly, maddeningly, give-away-all-his-money good - Katie's sums no longer add up, and she is forced to ask herself some very hard questions...Nick Hornby's brilliant new novel offers a painfully funny account of modern marriage and parenthood, and asks that most difficult of questions: what does it mean to be good?